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Messages - sark

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1
Arctic sea ice / Re: polar vortex - where?
« on: November 13, 2019, 09:55:11 AM »
This type of chart is a cross section of the entire polar cell, basically.  Geopotential height = what altitude in feet is a certain pressure reading.  This type of chart has a scale of pressure from top to bottom, and the colors represent height anomalies.  Warm air expands and a big area of warm air is high pressure and takes up more space in the atmosphere, so the geopotential height rises

charts can be found here: 

https://www.cpc.ncep.noaa.gov/products/precip/CWlink/daily_ao_index/ao.shtml

watch some Gav's weather vids and Nutrien Ag Solutions forecasts on YouTube and you'll find someone who explains these bits clearly for you

Basically when you look at the Arctic on something like https://climatereanalyzer.org/reanalysis/daily_maps/ and you see heat anomalies at the surface, pretty sure fire bet there's a high geopotential height anomaly just about directly overhead

We've had a huge geopotential height anomaly over the Arctic for the past 7 months, more than any other year

it comes down to polar vortex destruction pretty much in both hemispheres

2
https://www.metoffice.gov.uk/research/climate/seasonal-to-decadal/gpc-outlooks/ens-mean

UK Met Office seasonal prediction done by a dynamic numerical model ensemble, pictured below is Sea Level Pressure for Nov/Dec/Jan

You wouldn't know it by looking at the product's other maps except maybe the 500mb anomaly.  Temps are high in the Arctic but not over Antarctica, not even at 850mb.  This does predict a deep hole of -60 meters GPH over Greenland/Iceland... but when, and how?

This would be a very positive NAO forecast, +NAM, and negative Southern Annular Mode.  If the sudden & dynamic final warming of the Southern Hemisphere's winter PV hits the Antarctic like it did the Arctic this year, wow.

CFSv2 is on this pattern also in December

https://www.tropicaltidbits.com/analysis/models/?model=cfs-mon&region=nhem&pkg=mslpa&runtime=2019111206&fh=0

but the temps are warm.

Why the low sea level pressure?  Storms?

3
Global winds reaching close to baseline here.

I'd have to refer you to this for more, since I can't see how to explain it quite yet

https://doi.org/10.1175/MWR3293.1

4
I'm so lost, Sark.  Sorry for my ignorance, but what is the GIF showing?

That gif is a 500 mb anomaly from Tropical Tidbits for a mid-August GFS run with an overlaid gif of mechanical precession.

I put it together because it is always possible to see, sometimes quite obvious to see, a retrograde wave of high pressure against the Rossby waves.  The timing seems to be somewhere around 8 days.

Bear in mind this is in forecast and an analysis of operational hour 0's would be more fruitful.  I'm probably working on stringing those together next, to create a chart gif consisting of only historical data as modeled in these weather models with no forecast data, spanning over a month's time, for example.

I'm tending toward this concept that the heat incursions, atmospheric height anomalies, and flow characteristics over the Arctic are less Rossby waves and more "mechanical".  Thought experiment: If the troposopheric polar vortex starts fragmenting, that's bigger than Rossby wave breaks.  In fact, the cycle of fragmentation and slamming back together in the tropospheric polar vortex would guide Rossby wave patterns, as opposed to Rossby wave peaks breaking in the Arctic causing the same thing.

Because dual-and-simultaneous ridges from both sides of the planet meeting at the North Pole doesn't look like Rossby waves to me.  It looks like the polar cell ripping into fragments, mainly two, causing two ridges to be pulled into the Arctic in the void left behind

These aren't wave breaks, it's just empty space where there used to be a polar cell.

The interaction between the packets of "polar cell" is becoming more like the Fujiwhara effect

5
GFS runs have all slammed into alignment suddenly.  GFS accuracy at 7 days is trending pessimistic

The polar cell is wobbling, gyrating, as well as splitting up?  As a vortex this thing is "roping out" and forming stringers.  that's my view

6
there's been a real nice oscillation going on this thing all year long ... but ... if this wave is normal howcome there's no word for it when I ask?

folks, I'm sorry about these gifs :>

7
Expect to see all manner of negative Arctic Oscillation on the GFS today.

8
"you all know what happens next right"

I do not

What happens next?

it splashes back together again in the middle

9
The 00Z is coming in and will be one of the more moderate members of the AO ensemble, which I will be checking in morning

https://www.cpc.ncep.noaa.gov/products/precip/CWlink/daily_ao_index/ao.sprd2.gif

I'm been getting sick of looking at 2 polar cells and proving that our May-October period was the worst footing our polar vortex system has ever endured

https://imgur.com/a/rgvIwTv

you all know what happens next right

10
GFS is running away after hour 240 consistently for several days now.  It's providing lots of very interesting opportunity in things like potential vorticity and jet stream dynamics *all* available on tropical tidbits press > press +++++

https://www.tropicaltidbits.com/analysis/models/?model=gfs&region=nhem&pkg=mslp_pcpn_frzn&runtime=2019110618&fh=6

but the ECMWF is handling it well

in GFS you can see exactly what happens Nov 14-17.  select 2 PVU pressure & wind on the GFS in NHEM view.  Or just jet stream.  You see big temperate air packets getting pulled in over the Beringian and Scandinavian blocking pattern

from both sides simultaneously :[

There still has been no purple on ECMWF near the 14th-17th.  it's just as bad as GFS frankly but it doesn't achieve the shots colliding in center violently thing

I would expect it to continue to act just as awfully in 2020 if not worse, but we're learning all new ways that it *can* look also

this blob is showing us how bad that frozen in anticyclone jet was over Greenland on October 26.

ridges in the jet stream bending up so high on the planet that they reach the North Pole.  but the polar front keeps this from happening and is the reason for freezing temperatures, that and all the ice conspire to create a polar front

but the polar front is breaking at least every 16 days going on 7 and a half months now.  It's due on the 15th if not the 14th, and that's when it should be peaking

in the GFS these temperate air packets shoot in violently and collide in the middle, which goes bright purple on the 500mb anomaly,  less like a splashing rossby wave and more like a dynamic dual/tri/wobble poling of the whole polar cell ... the whole "thing" ripping in half.

that's why it doesn't make much sense for the wave breaks to strike exactly there simultaneously with the MJO in wave 7 or wherever it is.  it's more like the Fujiwhara effect between two hurricanes.  its not quite a Rossby wave break, it's just stringers in the tropospheric polar vortex.

11
winds at 10hPa are currently forecast by GEFS on a trajectory to hit 0 somewhere near the end of November.  November 27th is the date to beat for sudden stratospheric warming, that would be the earliest recorded

I don't know which is better, if it just dies early and forms back up, maybe it could be stable.  Or it might just ping pong around the Arctic for a month like it did in 2018, elongate, and then die.  so far this has given the impression of a very dynamic and major sudden stratospheric warming.

this is the 384 forecast hour at Nov 20

12
I'm trying to show that when you take the seasonal map of a similar period, it will show the similar amounts of delta, I could run them again with same year may-oct but the point remains, I don't see anything tremendous about this years seasonal anomaly when you compare to previous years.

then I must be seeing something wrong

lock the time period, lock the scale, and run ever year in the archive

it's *blinding*

13
I think your charts are showing a period of a year and a half.

the reason to look at the period of May - October is dual.  One, the event unfolding worldwide.  It started on May Day 2019.  That's what got this thread started. 

I'll repost some images from earlier pages if I think I can answer the question, but it doesn't help when the information is as buried as it is now.  This needs to be collated.

JJA would be a fine period.  2019 beats all there too.  But don't forget May when it all began, and be aware we're into month 7 now

you start broadening the lens from May through October and you have a 100 meter geopotential height anomaly in the Arctic over *that* period?

Those were our stable months.

Looking at month by month temperature anomalies over the past few years bears this out.  It's the Warm Arctic, Cold Continents phenomena.

It has become year round.

14
Why would 2018 be included in the season May - October of 2019?  (growing season for US Ag)

15
Since the forecast for this November was so similar to reanalysis Nov '18

I tacked Nov '18 onto the end of the past 6 months

Nothing like it since at least 1948.  November is not needed for that trick.  There is a huge structural anomaly over the North Pole this year.  It is not like the other years.  Not even as bad as summers of 1959 or 1960.  The polar cell is getting shredded apart right now, not like usual.

I bicycled out of the San Juan mountains of Colorado in November of 2016, traveling South.  I remember 2016 on these same charts.  November of 2016 was astonishingly bad, but I remember thinking it's not runaway, got bored and turned away.  It was expected to be bad

May - October, not a time known for Arctic Amplification, with a 6 month polar height anomaly of A HUNDRED METERS

that's unexpected.

we are having a tremendous world-record colossal polar geopotential height centered right over the North Geomagnetic Pole, slashing right through our traditionally stable seasons

nobody can freak out because they'd lose their health insurance.  I get it.  what if next year gets better and it won't do us in until the next solar minimum?  then you'd look like a real jerk

the tropics are flooding freely into the central Arctic like never before, and basically the whole system of polar vorticity just octopuses out in response.  What was that ancient hypothesis of Open Polar Sea, the polar cell is made of islands and the North Pole is Tropical?  maybe a genetic memory of the the late Eocene?

well, that's gonna speed up the day.

whatever is stacked up to cause this is a threat and needs to be confronted IMHO

Lord Jesus, Be a Sunspot

16
The QBO is proceeding peacefully.

Point in favor of not runaway IMHO

We could create a runaway index.  One factor could be consecutive months being all time record warm.  Length * height of geopotential anomalies over the poles.  Number of sudden stratospheric warmings in the past 10 years.. I think we're at 8 or 9 on that front

Was there two SSW in JFM of 2014?

What else might be included?

17
This is super far out but it illustrates what Sark is describing perfectly. And while it is super far out I think we will see a look like this by the middle of the month.

That normative anomaly was good.  Less energetic, more diffuse, not as simple.

That's what it looks like now for the 15th.  way more diffuse but right on time for 16 days.  October 26-28th was when the wave break & anticyclone over Greenland reached its apex.  This ain't a frozen in tropospheric polar vortex anticyclone though.  in the subsequent forecasts,  it's just wide open like Oct 4.

seeing that the model is capable of something so structurally severe was blinding.  that was some flavor of runaway.

anyway, this was a great tool at the time

18
I don't always read this forum.  You're either going to be helpful  or not.

19
In case anyone missed it.

This got my pulse up.  It was 2 hours before the ECMWF showed a more diffuse setup to the event beginning at hour 240

A lot of forecasters took this run seriously, which surprised me, so what you might have read in the past day about long range weather forecast could have been based on this runaway model.

Ever seen anything like it?

20
In case anyone missed it, there was a GFS run that flat out ran away after hour 240...

it'll be available here for several more days until it cycles out

https://www.tropicaltidbits.com/analysis/models/?model=gfs&region=nhem&pkg=z500a&runtime=2019110300&fh=240

As a diagnostic it is a valuable run to look at all the various attributes.  it's one to study.  we're seeing what happens when the polar front is broken completely and tropical air floods in to the Arctic from all sides.  When this happens, the polar cell is completely flung afield.

Subsequent runs have not broke so completely and we're starting to get an inkling of what it will look like.  It's bad.  It adds a 7th month to extreme polar atmospheric height anomalies.  It's a '57 or '59 or '60 on a much warmer Earth.  It's not a runaway in week 3 in the latest runs, but it is bad.

Speaking of:  here's Elwynn Taylor speaking in June of 2018... another who made the mistake of being bullish corn.  Well, ya can't help it :)

What this man saw back in the 80's is extraordinarily interesting and is observed in a chart, although I think the progression has been interrupted somewhat in our new, modern climatology.

https://www.cpc.ncep.noaa.gov/products/precip/CWlink/pna/JFM_season_nao_index.shtml


21
The forum / Re: Forum Decorum
« on: November 04, 2019, 06:32:42 AM »
Keep doing your thang.

well here's the deal.  I'm not going to put forward any effort.  I won't necessarily lock, delete, keep going, or stop.

anyone can come and deface it with denier style reasoning and that's fine.  I'm basically finished with the work and the thread is probably not going to be useful, going forward.  this is not the appropriate place, frankly.

that being said, there's really no reason to stop posting updates either.  I just don't know if that will happen or not.

let's hope the idea is batshit and this can come out as a climate thriller novel in a year.  that would be fun.

for now I'll just point you to my twitter @systemrename which gets updated more frequently, because it's been more convenient.  https://twitter.com/systemrename

22
There is an ongoing scientific investigation into whether or not the hemispheres can be connected in this way.

For me, it's much more simple than that.

Isaiah 28:20

The bed is too short to stretch out on, the blanket too narrow to wrap around you.

23
The forum / Re: Forum Decorum
« on: November 03, 2019, 11:50:44 PM »
locked or unlocked makes no difference to me.  it's unlocked.

24
The forum / Re: Forum Decorum
« on: November 03, 2019, 09:23:59 PM »
I'm locking my thread, and I've already taken a copy for my use

25
This line of thinking should be assessed by someone else.  It's not going to be debated emotionally here on this hobby forum.  I'm not here to play scientist with you lot or participate in a nerd fight.

How many times can I repeat the thesis in question?  It must be a round peg for square holes.

Polar vortex destruction is leading to decreasing atmospheric angular momentum, which is a feedback upon itself.

Major factors include:

1) ocean heat / thin sea ice
2) solar minimum
3) annual geopotential heights

If this is true, it is an unassessed feedback in dynamics that could meet the definition of abrupt runaway, a self-reinforcing feedback loop that leads to a relatively rapid change of system mode.

If not true, we'll see AAM roar positive, continuing to oscillate along a reasonable trend line, even if long term in decline.  In that case, it's just abrupt normal apocalyptic mainstream climate change,  which is well covered already.

I've not seen it addressed yet, that's what I'm here for.  I appreciate defending this line of thinking against solid reasoning, but this isn't going to become another forum nerd fight.  This is just a place to put it all down for future reference.

It might be evident in precipitation quantities that exceed the increase expected by mean global temperature.  It might be evident in winds or relative AAM.  I don't even have access to the GSDM as the CPC product was taken down and passwords on GSDMsolutions changed *both* within the past year.

What do I do at this point?

26
Of course we have positive geopotential height anomalies over the arctic. That happens almost by definition! Arctic Amplification creates warmer air above the Arctic hence the anomalies.
And yes, as we move forward, the anomalies will be bigger and bigger.
Yet, it does not mean that the world is ending (yet)

Strawman

1.
an intentionally misrepresented proposition that is set up because it is easier to defeat than an opponent's real argument.

and it's a real habit

27
500 millibar height anomaly +/- 90 meters, period of May 1 - October 31 from 1948 - 2019

28
these are the years that stuck out in JJA anomalies and a couple of them beat '19 in severity & focus on the North Pole

but now we're kind of pushing 7 months straight :/

I'll have to re-do this on all the years in the archive using May-Oct to know if it beats all.  meanwhile the 06Z GFS is coming in

29
Lower level winter "splits" are not interesting, they happen every year very routinely. Does not mean anything. Just one example (the first date I randomly picked had it). You can find tons like these every year

this is why we do things like look at anomalies

but this isn't going to be assessed here on this forum.  i'm not here to play scientist, and I'm sure as hell not the one to assess this information

you'd have to beat this, not point at random

30
It usually doesn't happen all Spring & Summer & Autumn with a period of under 16 days, and then spread to the Southern Hemisphere.

Best I can suggest is check the rainfall quantities.  This should have increased more than the temperature increase would suggest, due to the falling AAM.

if this was 1968 or 1977 there would be less of a problem because the geopotential height over the Arctic was deep.  thick sea ice.  Now we seem to have the issue outlined above.  whatever influences are piled on here are resulting in a system that is showing signs of breaking.

How many stratospheric splits and SSW has the NHEM experienced since 2013?  Seems it ain't 0.6 per year.

31
When angular momentum is not conserved by parameterization in a weather model, it leads to a too-cold Southern Pole, as the models cannot resolve waves interfering with the stratospheric PV in the Southern hemisphere, and the lost momentum is rained out as precipitation.  Just sayin'

total rainfall should be showing increased in 2019 more than can be expected by the measly +1.3C global temp. I understand it can be difficult to get a good measurement of that.

Our global winds are crashing.

wind speeds at the surface rising, that means atmosphere slowing, right?

33
There is a convulsion coming

34
Posing a question, as I have no rigorous understanding as yet of the dynamics here.

Would it perhaps be implied here that there is increasing turbulence resulting in disconnections in behavior between layers of atmosphere? 

Or, if the apparent disconnections is purely coincidental, is what we are seeing evidence of increased turbulence and increased disruption of existing patterns?

That's an interesting question, afraid I can't touch it.

As far as what's in the forecast, the tropospheric polar vortex (or simply "Arctic air") is going to divide rather neatly into two chunks in the week Nov 7-14.  When looking at 50hPa the atmosphere responds in these GFS forecasts.  So basically you get  a perturbation and split polar vortex in the *troposphere* which then propogates upward and reaches as high as the top of the tropopause.

Does this convulsion enter the stratosphere and impact the winter Strat PV?

Not yet.

https://www.stratobserve.com/misc_vort3d

35
This is the 10hpa forecast as long as they make it (GFS). NO SPLIT AT ALL.

I hope your other data and musings are more exact

that's a different attribute at a different level.  no bite on the attitude.

https://www.wetterzentrale.de/en/topkarten.php?map=2&model=gfs&var=39&run=18&time=252&lid=OP&h=1&mv=0&tr=3#mapref

37
notice the tropopause?

38
Meanwhile, Looks increasingly like the nascent Northern polar vortex is being split in November. 

There is absolutely no polar vortex spilt on any models, any timeframes at all

This is for 12 Nov at 50hPa

39
The Southern Hemisphere's winter polar vortex has been destroyed by the Sudden Stratospheric Warming that began at the end of austral winter.

I will take questions now.

40
hour 198 on the GFS starts to get realistic in terms of jet stream.  there is now an early indication that the block forming up near Alaska will result in a strong anticyclonic jet stream in the Arctic.  This is what happened October 26th over Greenland.  That frozen in anticyclone was also picked up by GFS at hour 198.  It pierces the polar front and results in a strong anticyclonic jet stream inside the Arctic Circle.

*16 days.  up from 0 and 4 and 8*

Winter is powerful.  it will get cold.  There is a polar front beginning to  form up as the rest of the Arctic Ocean area cools.  there will be a winter stratospheric polar vortex.  I just don't think it'll be very stable, which is adding to the problem of anticyclones cutting the polar cell in half, which is adding to the split condition

so the conjecture is, this is a self-reinforcing dynamic mode change.  That would explain why 2 years looked damn similar in a row

41
This is an 18 October Global Synoptic-Dynamic Model plot showing 4 weeks of information that is able to be conveyed on a single chart.  It's called a phase space diagram and you'd have to watch Ed Berry explain it on YouTube. 

I had the good fortune to run into this recently. (first image)  It shows conditions leading to barely neutral to negative global wind

The AAM is computed by interolating forecast of the operational numerical weather model:  http://aam.earthrotation.net/rt/

GIFS 1 & 2 Northern Hemisphere & Southern Hemisphere show complete polar vortex breakdown at all  levels.  Something is wrong.

Below that is the ECMWF at hour 240 around November 11 which is still on an 8 day cycle of the polar cell gyrating in & out as it turns atop the Earth.  Once the rest of this area fills in and the winter tropospheric polar cell gets going, there are models indicating very low sea level pressure over the Arctic in DJF.  Well, maybe the built up atmospheric angular momentum that is conserved in models by parameter wants to now push it forward and create a very strong zonal jet stream over the U.S.  why not

I hope it works that way but about half of these waves are breaking through the jet stream in late Summer - Autumn

Anyway, a lot of the other indicators like La Nina temps off the South American West coast suggest continued negative global wind speed (Mr) as measured atmospheric angular momentum.

In that lecture linked above on this page of Ed Berry in 2018, he speaks about a risk.  Atmospheric super-rotation, a condition in which tropical convection firing in the ITCZ tends to accelerate the atmosphere faster than the Earth's rotation

Ed also attests to a recent (since the 90's) trend of lower AAM, while he also asks *why* does thin sea ice lead to a negative Arctic Oscillation.

I think they lost faith in the GSDM after 2018.  Just like the Madden-Julian Oscillation long-range weather indicator is increasingly stuck in Phase 8, 1,  and 2

Academics aren't allowed to say this stuff, and in Ed's lecture he doesn't finish the sentence, but an atmospheric super-rotation is what most planets do.  Like Venus.  He may have been about to describe the differences in where waves originate on such bodies

We are at points on both of those renowned teleconnections GWO and MJO indicating low atmospheric angular momentum and seem to be stuck there

In forecast these products rely on models but they have to be watched real time, but they should outperform numerical models

well they do.  the remaining polar low is in such a shape that it causes a split vortex.  We see it when polar arms get spun out by tropical highs busting right through the jet stream and sticking to the North Pole until they dissipate. 

Maybe a big driver of that is solar minimum.  I kinda pray it.  It's also super obvious that another big factor is thin Arctic sea ice.

What I don't think *anybody* expected was according disruption of the Southern polar cell.

We're right now seeing a sudden stratospheric warming following through from the stratosphere to the ground and it is predicted to final warm the winter polar vortex over Antarctica in the next few days.  Meanwhile, Looks increasingly like the nascent Northern polar vortex is being split in November.  This could be the earliest polar vortex sudden warming in NH winter ever.  I tend to think it will slightly defy description.

what we are seeing since 2013 and especially 2016, 2018, and 2019 is atmospheric restructuring.  all the processes of a stable global interglacial distribution of ground temperatures are broken.  the polar vortex, jet stream, zonal mass, and geopotential height over the poles.

this is the hothouse Eocene climate waking up.  how long is that supposed to take, 3-15 years?

WHY?  Well, one explanation is a self-reinforcing bad feedback loop worldwide with all these fatal factors piling on at once.

Jesus, be a sun spot.

42
New CanSIPS is out and this is the prediction for November

43
I actually hate this

November 18

Actual temp readings in the Arctic are *often* split into two poles of cold, and dear Lord the actual atmosphere responds

Why wasn't this a problem when it was driven by solar minimum and thick sea ice weather?  What the hell happened in 1977?  because the thin sea ice is part of what causes this

Now you got solar minimum & thin sea ice piling on and creating a deepening crisis wherein atmospheric angular momentum has fallen negative for 4 months and doesn't appear to be rising yet, in fact signs point to nope

Well you would too if you had to flow around this damn thing


44
plain 500mbs

First, well,
you see it

then a moment 48 hours from now

then the latest CFSv2 for November

lastly, November '18

spooky.

45
This is Ed Berry https://www.linkedin.com/in/ed-berry

One of the authors of the global synoptic–dynamic model (GSDM).  The product was available as GWO phase space on the CPC's website but it is currently offline there.


46
DUN DUN DUNNNN


47
Still have only seen the one site with an up to date charted AAM reading, atlas.niu.edu

This is a good explainer that describes what "Weak GWO" means, as is currently forecast

https://www.weather.gov/media/grr/GLOM2015/Presentations/Marino_GWOSevereStorms.pdf

weak global winds

it's been this way for four months.  I'd like to know what is the longest, weakest period of GWO in the archive

48
MJO ensemble forecasted into the circle of death

meaning what?

http://www.njstrongweatherforum.com/t511-what-is-the-mjo-really

on the first image in this thread you'll notice the MJO chart is up to date, because it was linked to a live image url. so the comment regarding what was shown at the time is unrelated to the up to date chart... you gotta scroll down to the bottom to see what it looked like in someone's response

49
IMHO

Yes, if it is weather in the continental midlatitudes of the Northern Hemisphere.  what we experience of weather is largely derived from the expression of the polar cell in this fluid system

Outside of the central tropics, the Earth's atmosphere progresses East, headed toward the rising sun.  Westerly Atmosphere flow.  Prevailing winds from the West

Overall the sky is flinging forward of the Earth's rotation, spinning faster than the planet.  this atmosphere direction is called zonal flow.  U+

it's a spiral from equator to pole.  like a twist top ice cream cone

where it twists, there's a jet stream

the polar cell is like a candy cherry garnish.  but your treat is melting in the sun & a little pool underneath the cherry has sent it adrift and it's wobbling around on top.

why not

Zonal flow causes winds from the West, or Westerlies, and these winds progress zonally like from Seattle to New York.

this could be described with flight of aircraft and angular momentum in the atmosphere & earth but thrust and friction and landing weight, a bit of a stretch for me, let's be honest

the opposite of zonal is meridional and that's wind blowing North South.  V+  Well,  since about the mid-1990's and definitely increasing the entire time since then is WHAT!?  not just of the jet stream, but everything.  literally weather extremes of ridges and lows and pretty much all storms.  Your situation is exactly that, something that always existed, but now it's severe weather.  The jet stream is crashing into the Earth.

well the major torque exerted between the rotating earth, the rotating fluid core, and the rotating atmosphere, and hell Retrograde planets & the Sun too, it is conserved.  AAM -is- slowing over time in our measurements.  Meridional measurements are pretty good and um, wow

https://www.timeanddate.com/time/earth-rotation.html#calc-daylength

because all the North South long contorted dissolving breaking jet stream action has begun scrubbing into the Earth with meridional friction.  letting the clutch out.

the Earth is speeding up.  the Earth's relative motion with regard to the atmosphere is catching up.  Days are shorter and gravity waves are sound

Climate models need to have atmospheric angular momentum reinforced with a parameter so it is not lost, because they're still practicing on the QBO

if GW isn't conserved in an atmospheric model, the energy basically gets "rained out" and the south pole gets very cold, because they don't have waves that can jack into the strength of the Antarctic winter polar vortex, which would become deeper in a warming model

the suspected reason for the too cold pole is the lack of wave interaction with the winter PV over Antarctica... so this SSW we are still having over Antarctica nearing its final warming.  Brutal

Because the slowing at the north pole has translated to the Southern hemisphere with some torque of its own and the whole entire atmosphere got VERY slow recently, about the slowest on record from when I had a chance to see a good record of AAM.  Right around Oct 1

So yeah pretty much any annoying weather is your own personal observation of it since the 90's but obviously since 2014

50
bbr and others... now I see it.  compression snows and cut off lows

SNOW I SEE IT

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